The list of galaxies analysed by our pipeline was established by [1]}. This catalogue was compiled using a fully unsupervised method based on the use of a stochastic iterative scheme specifically tailored to the star–galaxy separation problem. It sets up a catalogue of extended extragalactic sources. This approach first relies on a random sampling of the data points then on a random selection of a dimension in the analysed data space at each iteration. This method applies a hierarchical density-based clustering method [2]} and an automatically optimised supervised method [3]} trained on the initial unsupervised solution obtained at each iteration.
The method analyses Gaia  DR2 combined with the AllWISE survey [4]}.
